* {
    margin: 0;
    padding: 0;
}
body {
    height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    background-color: #000;
    position: relative;
}
.battery {
    width: 200px;
    height: 320px;
    background-color: #fff;
    border-radius: 10px 10px 5px 5px;
    position: relative;
    // 电池上面凸出来的部分
    &::before {
        content: '';
        width: 50px;
        height: 20px;
        background-color: #fff;
        position: absolute;
        top: -20px;
        left: 50%;
        margin-left: -25px;
        border-radius: 5px 5px 0 0;
    }
    // 充电特效层
    &::after {
        content: '';
        position: absolute;
        left: 0;
        right: 0;
        top: 90%;
        bottom: 0;
        border-radius: 10px 10px 5px 5px;
        // 渐变背景
        background: linear-gradient(to bottom, #04e963 0%, #0bdf9f 44%, #0bdfc3 100%);
        animation: charge 10s linear infinite;
    }
}
.cover {
    width: 100%;
    height: 100%;
    position: absolute;
    left: 0;
    top: 0;
    z-index: 1;
    overflow: hidden;
    &::before {
        content: '';
        width: 400px;
        height: 400px;
        background: rgba(255, 255, 255, 0.8);
        position: absolute;
        border-radius: 40% 30%;
        left: -50%;
        animation: coverBefore 10s linear infinite;
    }
    &::after {
        content: '';
        width: 400px;
        height: 400px;
        background: rgba(255, 255, 255, 0.7);
        position: absolute;
        border-radius: 42% 40%;
        left: -50%;
        animation: coverAfter 10s linear infinite;
    }
}

@keyframes charge {
    0% {
        top: 100%;
        border-radius: 0 0 5px 5px;
        filter: hue-rotate(90deg);
    }
    95% {
        top: 5%;
        border-radius: 0 0 5px 5px;
    }
    100% {
        top: 0%;
        filter: hue-rotate(0deg);
    }
}

@keyframes coverBefore {
    0% {
        transform: rotate(0deg);
        bottom: 0%;
    }
    100% {
        transform: rotate(360deg);
        bottom: 100%;
    }
}

@keyframes coverAfter {
    0% {
        transform: rotate(30deg);
        bottom: 2%;
    }
    100% {
        transform: rotate(360deg);
        bottom: 95%;
    }
}
